Re: Re: S-Video to Composite

["Dan" <dtoma@xxxxxxx>]

The problem with the 100ohm resistor is that it can severely decrease the
video level.
Take into consideration that the input impendance is around 75ohm, so an
100ohm resistor can decrease the signal more than two times.
Dan
  ----- Original Message ----- 
  From: Keith Doxey <ukha@xxxxxxx> 
  To: ukha_d@xxxxxxx 
  Sent: Friday, January 17, 2003 4:00 PM
  Subject: [ukha_d] Re: S-Video to Composite


  Exactly the same way if its like the one I got from Maplin.

  For S-Video to Composite I put a 470pF and 100 ohms in series from
  Chroma to Luma and the Luma signal then becomes composite.

  The same method can be used to feed a composite signal into an
S-
  Video input but as Dan points out it isnt that simple. To do it 
  properly requires filters.

  Although the Capacitor/Resistor method will give a colour picture
  into an S-Video input there will be all sorts of patterning or 
  softening of the picture and it will be inferior to the original
  Composite signal.

  The only justifiable reason for doing passive Composite to S-Video
  conversion is if you only have an S-Video input available and the
  source is composite only.

  Keith

  --- In ukha_d@xxxxxxx, "Dan" <dtoma@f...> wrote:
  > You're right.
  > It seems that it has just a capacitor, because there is nothing
  active inside.
  > I wonder how it does reverse conversion, because it is not so
  simple.
  > You must put some good filters for the color carrier.
  > 
  > Dan



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